<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <el-alert title="添加商品信息" type="info" center :closable="false" show-icon>
      </el-alert>
      <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <el-form :model="addForm"
               :rules="addFormRules"
               ref="addFormRef"
               label-width="100px"
               label-position="top">
        <el-tabs v-model="activeIndex" tab-position="left"
                 :before-leave="beforeTabLeave"
                 @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-row :gutter="15">
                <el-col :span="8">
                  <el-cascader
                      v-model="addForm.goods_cat"
                      :options="cateList"
                      :props="cateProps"
                      @change="handleChange"></el-cascader>
                </el-col>
                <el-col :span="6">
                  <el-alert
                      title="请选择三级分类"
                      type="warning"
                      show-icon :closable="false">
                  </el-alert>
                </el-col>
              </el-row>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <el-form-item :label="item.attr_name"
                          v-for="item in manyTabData"
                          :key="item.attr_id">
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb"
                             v-for="(cb,i) in item.attr_vals"
                             :key="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name"
                          v-for="item in onlyTabData"
                          :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <el-upload
                :action="uploadURL"
                :on-preview="handlePreview"
                :on-remove="handleRemove"
                list-type="picture"
                :headers="headerObj" :on-success="handleUploadSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <el-button type="primary" class="goodsAddBtn" @click="addGoods">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <el-dialog
        title="图片预览"
        :visible.sync="previewDialogVisible"
        width="50%">
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'

export default {
  data() {
    return {
      activeIndex: '0',
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat: [],
        pics: [],
        goods_introduce: '',
        attrs: [],
      },
      addFormRules: {
        goods_name: [
          {required: true, message: '请输入商品名称', trigger: 'blur'}
        ],
        goods_price: [
          {required: true, message: '请输入商品价格', trigger: 'blur'}
        ],
        goods_weight: [
          {required: true, message: '请输入商品重量', trigger: 'blur'}
        ],
        goods_number: [
          {required: true, message: '请输入商品数量', trigger: 'blur'}
        ],
        goods_cat: [
          {required: true, message: '请选择商品分类', trigger: 'blur'}
        ],
      },
      cateList: [],
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children',
        expandTrigger: 'hover',
      },
      manyTabData: [],
      onlyTabData: [],
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      previewPath: '',
      previewDialogVisible: false,
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    async getCateList() {
      const {data: res} = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类数据失败')
      }
      this.cateList = res.data
    },
    handleChange() {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    beforeTabLeave(activeName, oldActiveName) {
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请选择商品分类')
        return false
      }
    },
    async tabClicked() {
      if (this.activeIndex === '1') {
        const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,
            {params: {sel: 'many'}})
        if (res.meta.status !== 200) {
          this.$message.error('获取商品参数失败')
        }
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTabData = res.data
      } else if (this.activeIndex === '2') {
        const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,
            {params: {sel: 'only'}})
        if (res.meta.status !== 200) {
          this.$message.error('获取商品属性失败')
        }
        this.onlyTabData = res.data
      }
    },
    handlePreview(file) {
      this.previewPath = file.response.data.url
      this.previewDialogVisible = true
    },
    handleRemove(file) {
      const filePath = file.response.data.tem_path
      const index = this.addForm.pics.findIndex(x => x.pic === filePath)
      this.addForm.pics.splice(index, 1)
    },
    handleUploadSuccess(response) {
      const picInfo = {pic: response.data.tmp_path}
      this.addForm.pics.push(picInfo)
    },
    addGoods() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项')
        }
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        this.manyTabData.forEach(item => {
          const manyParam = {
            attr_id: item.attr_id,
            attr_val: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(manyParam)
        })
        this.onlyTabData.forEach(item => {
          const onlyParam = {
            attr_id: item.attr_id,
            attr_val: item.attr_vals
          }
          this.addForm.attrs.push(onlyParam)
        })
        form.attrs = this.addForm.attrs
        const {data:res} = await this.$http.post('goods', form)
        if (res.meta.status !== 201) {
          this.$message.error('添加商品失败')
        }
        this.$message.success('添加商品成功')
        this.$router.push('/goods')
      })
    },
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style scoped>
.el-steps {
  margin: 15px 0;
}

.el-alert {
  height: 40px;
}

.el-cascader {
  width: 100%;
}

.el-checkbox {
  margin: 0 10px 0 0 !important;
}

.previewImg {
  width: 100%;
}

.goodsAddBtn {
  margin-top: 15px;
}
</style>